JP5690071B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp such as a position lamp or a tail lamp using an LED as a light source.

  A vehicle lamp such as a position lamp or a tail lamp using an LED as a light source is configured by housing an LED and a reflector in a lamp chamber defined by a housing and a transparent outer lens covering its opening. A lens cut is applied as a light diffusion process.

  In such a vehicular lamp, the reflector is made to satisfy the light distribution pattern defined in the law by the combination of the reflecting surface that reflects the light from the LED in the irradiation direction and the lens cut applied to the outer lens. It was.

  Patent Document 1 proposes that weak light exceeding the half-value angle of an LED is used for diffused light distribution by lens cut.

JP 2007-123027 A

  However, in conventional vehicle lamps, the light distribution pattern specified by the law is satisfied by the combination of the reflector reflecting surface (single focus reflecting surface) that reflects light from the light source only in the irradiation direction and the lens cut of the outer lens. In order to do so, a large reflecting surface is required, so that the design vertical width is widened and the design width is limited, and the vehicle lamp itself is increased in size. For example, if the vertical width of the design is narrow, the amount of light in the vertical direction required by laws and regulations is insufficient, and it is impossible to secure a reflective surface size that can satisfy the luminous intensity required at the standard point.

  In addition, the configuration proposed in Patent Document 1 has a problem that the required light intensity at the standard point cannot be satisfied because weak light exceeding the half-value angle is used for diffused light distribution by lens cutting.

  Furthermore, in order to satisfy the light intensity in the left-right direction specified by the law, there is a problem that the angle at which the light is bent is increased by the lens cut, the light loss is increased, and the light use efficiency is lowered.

  The present invention has been made in view of the above problems, and the object of the present invention is to increase the design width and reduce the size by reducing the vertical width of the design while ensuring the light distribution pattern specified by the law. An object of the present invention is to provide a vehicular lamp.

In order to achieve the above object, according to the first aspect of the present invention, in the lamp chamber defined by the housing provided with the opening and the transparent outer lens covering the opening, the optical axis direction is downward of the lamp. A reflector having a plurality of LEDs arranged in the lateral direction of the lamp and a plurality of reflecting surfaces divided in the lateral direction of the lamp corresponding to the plurality of LEDs is housed, and a lens cut is applied to the outer lens. In vehicle lamps,
The plurality of divided surfaces divided in the width direction of the lamp of the reflector are adjacent to the reflection surface adjacent to the center of the lamp and the reflection surface adjacent to the center of the lamp in a front view of the lamp, and The reflective surface located at a position away from the center is divided so that the center line of the lamp is the axis of symmetry,
Of each reflecting surface divided in the width direction of the lamp, the reflecting surface adjacent to the center of the lamp is arranged to be positioned in front of the lamp irradiation direction with respect to the reflecting surface positioned away from the center of the lamp. And
Each of the plurality of reflection surfaces divided in the width direction of the lamp includes a first reflection surface that reflects light from the LEDs in the irradiation direction of the lamp, and light reflected by the first reflection surface. A second reflecting surface that reflects upward by an angle α and a third reflecting surface that reflects downward by an angle α;
Of the plurality of reflecting surfaces divided in the width direction of the lamp, the reflecting surface located at a position away from the center of the lamp is set in the left-right direction by an angle β with respect to the irradiation direction of the light from each LED. A fourth reflecting surface to be reflected is formed;
In the reflection surface divided in the width direction of the lamp, at the center of the lamp, the reflection surface adjacent to the center of the lamp, the reflection surface adjacent to the center of the lamp, and a position away from the center of the lamp. A fifth reflecting surface that reflects light from each LED in the left-right direction by an angle γ with respect to the irradiation direction is formed between the reflecting surfaces positioned,
Between the first reflective surface and the second reflective surface are arranged adjacent to each other with a step defining each reflective surface,
The second reflecting surface is disposed below the first reflecting surface in the optical axis direction of the LED, and is in front of the illumination direction of the lamp in a direction perpendicular to the optical axis direction of the LED. It is arranged at a position ahead of the first reflecting surface.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the angle α is set to 5 ° , the angle β is set to 65 °, and the angle γ is set to 70 ° .

According to the present invention, in addition to the first reflecting surface that reflects the light from each LED in the irradiation direction on the reflecting surface of the reflector that is divided into a plurality of parts in the lateral direction, the light from the LEDs is directed to the irradiation direction. Second and third reflecting surfaces that reflect upward and downward by an angle α (= 5 °), and a second reflective surface that reflects light from the LEDs in the left-right direction by an angle β (= 65 °) with respect to the irradiation direction. 4 and a fifth reflecting surface that reflects in the left-right direction by an angle γ (= 70 °) is formed, so that the amount of light in the vertical direction required by the law increases and the design vertical width is minimized. The vertical size of the reflecting surface that can satisfy the light intensity required at the point can be minimized. For this reason, while ensuring the light distribution pattern prescribed | regulated by the law, the design up-and-down width can be reduced and the design width of the said vehicle lamp can be expanded and reduced in size.

The light from the light source is bent left and right by an angle β (= 65 °) with respect to the irradiation direction by the fourth reflecting surface formed on the reflector, and the angle γ with respect to the irradiation direction by the fifth reflecting surface. Since it is bent in the left-right direction by (= 70 °) , the bending angle of the light in the left-right direction due to the lens cut of the outer lens can be minimized, and the loss of light is suppressed to improve the utilization efficiency.

1 is a front view of a vehicular lamp according to the present invention. It is the sectional view on the AA line of FIG. It is a perspective view of the reflector of the vehicular lamp which concerns on this invention. It is a top view of the reflector of the vehicle lamp which concerns on this invention. It is a front view of the reflector of the vehicle lamp which concerns on this invention. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is a figure which shows the aim point of each reflective surface of the vehicle lamp which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and the illustrated vehicular lamp 1 is a tail lamp disposed at the rear of a vehicle, for example. As shown in FIG. 2, a plurality of (four in this embodiment) LEDs 5 and reflectors 6 are accommodated in a lamp chamber 4 defined by a housing 2 and a transparent outer lens 3 covering the opening. ing.

  The housing 2 is integrally formed in a box shape with a light-impermeable resin, and a fitting groove 2a is formed at the periphery of the opening. The outer lens 3 is formed in a box shape with a transparent light transmissive resin, and the outer lens 3 is attached to the housing 2 by heating and bonding the periphery of the opening. The outer lens 3 is subjected to lens cutting as a light diffusion process.

  Four LEDs 5 (only one is shown in FIG. 2) that are light sources emit light at appropriate intervals in the left-right direction (perpendicular to the plane of FIG. 2) on the lower surface of the LED board 7 installed horizontally in the lamp chamber 4. The reflector 6 is mounted with the shaft facing downward, and the reflector 6 is disposed below the LED 5.

  Here, the detail of a structure of the reflector 6 is demonstrated based on FIGS.

  3 is a perspective view of the reflector, FIG. 4 is a top view of the reflector, FIG. 5 is a front view of the reflector, and FIG. 6 is a sectional view taken along line BB in FIG.

  The reflector 6 is integrally formed of a light-impermeable resin, and a reflection surface 8 is formed below a mounting portion 6a that forms a horizontal plane. The reflection surface 8 is subjected to a reflection treatment. As a result, aluminum vapor deposition is applied.

Thus, the reflecting surface 8 of the reflector 6 is divided into four reflecting surfaces 8A in the width direction corresponding to the number of the LEDs 5, and the light L from each LED 5 is included in the four divided angle reflecting surfaces 8A. Is reflected in the irradiation direction (HV direction) of the lamp 1, and the second reflection surface is configured to reflect the light L upward by an angle α (5 ° in the present embodiment) with respect to the irradiation direction. A third reflecting surface 8c that reflects the light 8b and the light L downward by an angle α (= 5 °) is formed. The first reflecting surface 8a forms a rotating paraboloid with the LED 5 as a focal point.

  Further, on both the left and right sides of the reflecting surface 8, there are fourth reflecting surfaces 8d that reflect the light L from each LED 5 in the left-right direction by an angle β (65 ° in the present embodiment) with respect to the irradiation direction (HV direction). A fifth reflecting surface 8e for reflecting the light L from each LED 5 in the left and right directions by an angle γ (70 ° in the present embodiment) is formed in a staircase pattern in a state of standing upright in the vertical direction. Are formed in a state of standing upright in the vertical direction.

  As described above, in the vehicular lamp 1 according to the present embodiment, the reflecting surface 8 of the reflector 6 is divided into four reflecting surfaces 8A in the lateral direction, and each of the divided reflecting surfaces 8A is provided with each LED 5. In addition to the first reflecting surface 8a that reflects the light L in the irradiation direction, the second reflecting surface 8b that reflects the light L from the LED 5 upward by an angle α (= 5 °) with respect to the irradiation direction and the angle α A third reflecting surface 8c that reflects downward by (= 5 °) is formed, and a fourth reflecting surface 8d that reflects light L from each LED 5 by an angle β (= 65 °) with respect to the irradiation direction. Since the fifth reflecting surface 8e that reflects only γ (= 70 °) with respect to the irradiation direction is formed, the amount of light in the vertical direction required by law increases, and even if the design vertical width is reduced, the standard point In addition to satisfying the light intensity required in The vertical size of the incident surface 8 can be minimized. Therefore, the design width of the vehicular lamp 1 can be increased and reduced in size by reducing the vertical width of the design while ensuring the light distribution pattern defined in the regulations.

  Further, in the vehicular lamp 1 according to the present embodiment, the fourth and fifth reflecting surfaces 8d and 8e are formed on the reflecting surface 8 of the reflector 6, so that the light L from each LED 5 is the fourth reflecting surface 8d. Is bent in the left-right direction by an angle β (= 65 °) with respect to the irradiation direction, and is bent in the left-right direction by an angle γ (= 70 °) with respect to the irradiation direction by the fifth reflecting surface 8e. The bending angle of the light L in the left-right direction due to the lens cut can be minimized, and the loss of the light L can be suppressed to be small and the utilization efficiency of the light L can be increased.

Figure 7 shows the European ECE Regulation.
Target points of the first to fifth reflecting surfaces 18a to 18e of the reflector 6 of the vehicular lamp 1 according to the present embodiment with respect to the required range of luminous intensity defined in No. 50 (range of the luminous intensity minimum value 0.05 cd) Indicates.

  The present invention is applicable to all vehicular lamps including a position lamp, a tail lamp, and the like using LEDs as a light source.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2a Housing fitting groove 3 Outer lens 4 Lamp chamber 5 LED
6 Reflector 6a Reflector mounting portion 7 LED board 8 Reflector reflecting surface 8A Divided reflecting surface 8a First reflecting surface 8b Second reflecting surface 8c Third reflecting surface 8d Fourth reflecting surface 8e Fifth reflecting Surface L light

Claims (2)

A plurality of LEDs arranged in the lateral direction of the lamp in a lamp chamber defined by a housing provided with an opening and a transparent outer lens covering the opening; In a vehicle lamp that houses a reflector having a plurality of reflecting surfaces divided in the lateral direction of a lamp corresponding to a plurality of LEDs, and that has a lens cut on the outer lens,
The plurality of divided surfaces divided in the width direction of the lamp of the reflector are adjacent to the reflection surface adjacent to the center of the lamp and the reflection surface adjacent to the center of the lamp in a front view of the lamp, and The reflective surface located at a position away from the center is divided so that the center line of the lamp is the axis of symmetry,
Of each reflecting surface divided in the width direction of the lamp, the reflecting surface adjacent to the center of the lamp is arranged to be positioned in front of the lamp irradiation direction with respect to the reflecting surface positioned away from the center of the lamp. And
Each of the plurality of reflection surfaces divided in the width direction of the lamp includes a first reflection surface that reflects light from the LEDs in the irradiation direction of the lamp, and light reflected by the first reflection surface. A second reflecting surface that reflects upward by an angle α and a third reflecting surface that reflects downward by an angle α;
Of the plurality of reflecting surfaces divided in the width direction of the lamp, the reflecting surface located at a position away from the center of the lamp is set in the left-right direction by an angle β with respect to the irradiation direction of the light from each LED. A fourth reflecting surface to be reflected is formed;
In the reflection surface divided in the width direction of the lamp, at the center of the lamp, the reflection surface adjacent to the center of the lamp, the reflection surface adjacent to the center of the lamp, and a position away from the center of the lamp. A fifth reflecting surface that reflects light from each LED in the left-right direction by an angle γ with respect to the irradiation direction is formed between the reflecting surfaces positioned,
Between the first reflective surface and the second reflective surface are arranged adjacent to each other with a step defining each reflective surface,
The second reflecting surface is disposed below the first reflecting surface in the optical axis direction of the LED, and is in front of the illumination direction of the lamp in a direction perpendicular to the optical axis direction of the LED. The vehicular lamp is arranged at a position ahead of the first reflecting surface.
2. The vehicular lamp according to claim 1, wherein the angle α is set to 5 ° , the angle β is set to 65 °, and the angle γ is set to 70 ° .

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